Hi,
the double click on the MailBox or the Properties button, works only if you have the access right to that Mailbox.
To review access rights for all the Mailboxes in the system, you can do it from the Setting: Mailbox Browse
Hi, Paul.
Sounds like you're talking about REST API. And that your are overwriting data with older values if B managed to read record before A finished to update it. Classic conflict resolution ...